I use both, often without noticing. I think I tend to be more likely to use treble or trebled at the end of sentence and triple or tripled in the middle of one.

I use both, often without noticing. I think I tend to be more likely to use treble or trebled at the end of sentence and triple or tripled in the middle of one. Note, I am not claiming this as any sort of sensible usage, am just commenting on how I tend to use the words. My pronunciation of words like grass or bath is also similarly scattered. This confuses folk when they try and work out what class background I am from, which is something of an obsession for many people here in the UK.